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Port 9285 (n2h2server)

IANA assigns port 9285 to n2h2server: N2H2 Filter Service Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
n2h2server TCP N2H2 Filter Service Port Jim Irwin -
n2h2server UDP N2H2 Filter Service Port Jim Irwin -

Registry dates for this port: registered 2002-02.

Check what is listening on port 9285

Linux: is anything listening on TCP 9285?
sudo ss -tlnp 'sport = :9285'
Linux: UDP 9285
sudo ss -ulnp 'sport = :9285'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9285
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9285 '
Windows (Command Prompt)
netstat -ano | findstr :9285
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9285 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9285
From Windows
Test-NetConnection HOST -Port 9285
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9285

Block port 9285 in the firewall

ufw
sudo ufw deny 9285/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9285 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9285 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9285' -Direction Inbound -Protocol TCP -LocalPort 9285 -Action Block
ufw
sudo ufw deny 9285/udp
iptables
sudo iptables -A INPUT -p udp --dport 9285 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9285 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9285' -Direction Inbound -Protocol UDP -LocalPort 9285 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.